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-rw-r--r--epan/dissectors/packet-bfd.c931
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diff --git a/epan/dissectors/packet-bfd.c b/epan/dissectors/packet-bfd.c
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+/* packet-bfd.c
+ * Routines for Bidirectional Forwarding Detection (BFD) message dissection
+ * RFCs
+ * 5880: Bidirectional Forwarding Detection (BFD)
+ * 5881: Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)
+ * 5882: Generic Application of Bidirectional Forwarding Detection (BFD)
+ * 5883: Bidirectional Forwarding Detection (BFD) for Multihop Paths
+ * 5884: Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)
+ * 5885: Bidirectional Forwarding Detection (BFD) for the Pseudowire Virtual Circuit Connectivity Verification (VCCV)
+ * 7130: Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces
+ * 7881: Seamless Bidirectional Forwarding Detection (S-BFD) for IPv4, IPv6, and MPLS
+ * (and https://tools.ietf.org/html/draft-ietf-bfd-base-01 for version 0)
+ *
+ * Copyright 2003, Hannes Gredler <hannes@juniper.net>
+ * Copyright 2006, Balint Reczey <Balint.Reczey@ericsson.com>
+ * Copyright 2007, Todd J Martin <todd.martin@acm.org>
+ *
+ * Copyright 2011, Jaihari Kalijanakiraman <jaiharik@ipinfusion.com>
+ * Krishnamurthy Mayya <krishnamurthy.mayya@ipinfusion.com>
+ * Nikitha Malgi <malgi.nikitha@ipinfusion.com>
+ * - support for MPLS-TP BFD Proactive CV Message Format as per RFC 6428
+ * - includes decoding support for Section MEP-ID, LSP MEP-ID, PW MEP-ID
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/expert.h>
+
+#include "packet-bfd.h"
+#include "packet-mpls.h"
+
+void proto_register_bfd(void);
+void proto_reg_handoff_bfd(void);
+
+static dissector_handle_t bfd_control_handle;
+static dissector_handle_t bfd_echo_handle;
+
+/* 3784: BFD control, 3785: BFD echo, 4784: BFD multi hop control */
+/* 6784: BFD on LAG, 7784: seamless BFD */
+/* https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=bfd */
+#define UDP_PORT_RANGE_BFD_CTRL "3784,4784,6784,7784"
+#define UDP_PORT_BFD_ECHO 3785
+
+/* As per RFC 6428 : https://tools.ietf.org/html/rfc6428
+ Section: 3.5 */
+#define TLV_TYPE_MPLSTP_SECTION_MEP 0
+#define TLV_TYPE_MPLSTP_LSP_MEP 1
+#define TLV_TYPE_MPLSTP_PW_MEP 2
+
+static const value_string mplstp_mep_tlv_type_values [] = {
+ { TLV_TYPE_MPLSTP_SECTION_MEP, "Section MEP-ID" },
+ { TLV_TYPE_MPLSTP_LSP_MEP, "LSP MEP-ID" },
+ { TLV_TYPE_MPLSTP_PW_MEP, "PW MEP-ID" },
+ { 0, NULL}
+};
+static const value_string bfd_control_v0_diag_values[] = {
+ { 0, "No Diagnostic" },
+ { 1, "Control Detection Time Expired" },
+ { 2, "Echo Function Failed" },
+ { 3, "Neighbor Signaled Session Down" },
+ { 4, "Forwarding Plane Reset" },
+ { 5, "Path Down" },
+ { 6, "Concatenated Path Down" },
+ { 7, "Administratively Down" },
+ { 0, NULL }
+};
+
+static const value_string bfd_control_v1_diag_values[] = {
+ { 0, "No Diagnostic" },
+ { 1, "Control Detection Time Expired" },
+ { 2, "Echo Function Failed" },
+ { 3, "Neighbor Signaled Session Down" },
+ { 4, "Forwarding Plane Reset" },
+ { 5, "Path Down" },
+ { 6, "Concatenated Path Down" },
+ { 7, "Administratively Down" },
+ { 8, "Reverse Concatenated Path Down" },
+ { 9, "Mis-Connectivity Defect" },
+ { 0, NULL }
+};
+
+static const value_string bfd_control_sta_values[] = {
+ { 0, "AdminDown" },
+ { 1, "Down" },
+ { 2, "Init" },
+ { 3, "Up" },
+ { 0, NULL }
+};
+
+#define BFD_AUTH_SIMPLE 1
+#define BFD_AUTH_MD5 2
+#define BFD_AUTH_MET_MD5 3
+#define BFD_AUTH_SHA1 4
+#define BFD_AUTH_MET_SHA1 5
+static const value_string bfd_control_auth_type_values[] = {
+ { BFD_AUTH_SIMPLE , "Simple Password" },
+ { BFD_AUTH_MD5 , "Keyed MD5" },
+ { BFD_AUTH_MET_MD5 , "Meticulous Keyed MD5" },
+ { BFD_AUTH_SHA1 , "Keyed SHA1" },
+ { BFD_AUTH_MET_SHA1 , "Meticulous Keyed SHA1" },
+ { 0, NULL }
+};
+/* Per the standard, the simple password must by 1-16 bytes in length */
+#define MAX_PASSWORD_LEN 16
+/* Per the standard, the length of the MD5 authentication packets must be 24
+ * bytes and the checksum is 16 bytes */
+#define MD5_AUTH_LEN 24
+#define MD5_CHECKSUM_LEN 16
+/* Per the standard, the length of the SHA1 authentication packets must be 28
+ * bytes and the checksum is 20 bytes */
+#define SHA1_AUTH_LEN 28
+#define SHA1_CHECKSUM_LEN 20
+
+static gint proto_bfd = -1;
+static gint proto_bfd_echo = -1;
+
+static gint hf_bfd_version = -1;
+static gint hf_bfd_diag = -1;
+static gint hf_bfd_sta = -1;
+static gint hf_bfd_flags = -1;
+static gint hf_bfd_flags_h = -1;
+static gint hf_bfd_flags_p = -1;
+static gint hf_bfd_flags_f = -1;
+static gint hf_bfd_flags_c = -1;
+static gint hf_bfd_flags_a = -1;
+static gint hf_bfd_flags_d = -1;
+static gint hf_bfd_flags_m = -1;
+static gint hf_bfd_flags_d_v0 = -1;
+static gint hf_bfd_flags_p_v0 = -1;
+static gint hf_bfd_flags_f_v0 = -1;
+static gint hf_bfd_detect_time_multiplier = -1;
+static gint hf_bfd_message_length = -1;
+static gint hf_bfd_my_discriminator = -1;
+static gint hf_bfd_your_discriminator = -1;
+static gint hf_bfd_desired_min_tx_interval = -1;
+static gint hf_bfd_required_min_rx_interval = -1;
+static gint hf_bfd_required_min_echo_interval = -1;
+static gint hf_bfd_checksum = -1;
+
+static gint hf_bfd_auth_type = -1;
+static gint hf_bfd_auth_len = -1;
+static gint hf_bfd_auth_key = -1;
+static gint hf_bfd_auth_password = -1;
+static gint hf_bfd_auth_seq_num = -1;
+
+static gint hf_bfd_echo = -1;
+
+static gint ett_bfd = -1;
+static gint ett_bfd_flags = -1;
+static gint ett_bfd_auth = -1;
+
+static gint ett_bfd_echo = -1;
+
+static expert_field ei_bfd_auth_len_invalid = EI_INIT;
+static expert_field ei_bfd_auth_no_data = EI_INIT;
+
+static gint hf_mep_type = -1;
+static gint hf_mep_len = -1;
+static gint hf_mep_global_id = -1;
+static gint hf_mep_node_id = -1;
+/* static gint hf_mep_interface_no = -1; */
+static gint hf_mep_tunnel_no = -1;
+static gint hf_mep_lsp_no = -1;
+static gint hf_mep_ac_id = -1;
+static gint hf_mep_agi_type = -1;
+static gint hf_mep_agi_len = -1;
+static gint hf_mep_agi_val = -1;
+static gint hf_section_interface_no = -1;
+/*
+ * Control packet version 0, draft-katz-ward-bfd-01.txt
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | My Discriminator |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Your Discriminator |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Desired Min TX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Required Min RX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Required Min Echo RX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+/*
+ * Control packet version 1, RFC 5880
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |Vers | Diag |Sta|P|F|C|A|D|M| Detect Mult | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | My Discriminator |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Your Discriminator |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Desired Min TX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Required Min RX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Required Min Echo RX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * An optional Authentication Section may be present:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Type | Auth Len | Authentication Data... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * There are 5 types of authentication defined:
+ * 1 - Simple Password
+ * 2 - Keyed MD5
+ * 3 - Meticulous Keyed MD5
+ * 4 - Keyed SHA1
+ * 5 - Meticulous Keyed SHA1
+ *
+ * The format for Simple Password authentication is:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Type | Auth Len | Auth Key ID | Password... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | ... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * The format for Keyed MD5 and Meticulous Keyed MD5 authentication is:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Type | Auth Len | Auth Key ID | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Key/Checksum... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | ... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * The format for Keyed SHA1 and Meticulous Keyed SHA1 authentication is:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Type | Auth Len | Auth Key ID | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Key/Checksum... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | ... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ *
+ */
+
+
+/* Given the type of authentication being used, return the required length of
+ * the authentication header
+ */
+static guint8
+get_bfd_required_auth_len(guint8 auth_type)
+{
+ guint8 auth_len = 0;
+
+ switch (auth_type) {
+ case BFD_AUTH_MD5:
+ case BFD_AUTH_MET_MD5:
+ auth_len = MD5_AUTH_LEN;
+ break;
+ case BFD_AUTH_SHA1:
+ case BFD_AUTH_MET_SHA1:
+ auth_len = SHA1_AUTH_LEN;
+ break;
+ default:
+ break;
+ }
+ return auth_len;
+}
+
+/* Given the type of authentication being used, return the length of
+ * checksum field
+ */
+static guint8
+get_bfd_checksum_len(guint8 auth_type)
+{
+ guint8 checksum_len = 0;
+ switch (auth_type) {
+ case BFD_AUTH_MD5:
+ case BFD_AUTH_MET_MD5:
+ checksum_len = MD5_CHECKSUM_LEN;
+ break;
+ case BFD_AUTH_SHA1:
+ case BFD_AUTH_MET_SHA1:
+ checksum_len = SHA1_CHECKSUM_LEN;
+ break;
+ default:
+ break;
+ }
+ return checksum_len;
+}
+
+static void
+dissect_bfd_authentication(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ int offset = 24;
+ guint8 auth_type;
+ guint8 auth_len;
+ proto_item *auth_item = NULL;
+ proto_tree *auth_tree = NULL;
+ const guint8 *password;
+
+ auth_type = tvb_get_guint8(tvb, offset);
+ auth_len = tvb_get_guint8(tvb, offset + 1);
+
+ if (tree) {
+ auth_tree = proto_tree_add_subtree_format(tree, tvb, offset, auth_len,
+ ett_bfd_auth, NULL, "Authentication: %s",
+ val_to_str(auth_type,
+ bfd_control_auth_type_values,
+ "Unknown Authentication Type (%d)") );
+
+ proto_tree_add_item(auth_tree, hf_bfd_auth_type, tvb, offset, 1, ENC_BIG_ENDIAN);
+
+ proto_tree_add_item(auth_tree, hf_bfd_auth_len, tvb, offset + 1, 1, ENC_BIG_ENDIAN);
+
+ proto_tree_add_item(auth_tree, hf_bfd_auth_key, tvb, offset + 2, 1, ENC_BIG_ENDIAN);
+ }
+
+ switch (auth_type) {
+ case BFD_AUTH_SIMPLE:
+ proto_tree_add_item_ret_string(auth_tree, hf_bfd_auth_password, tvb, offset+3,
+ auth_len-3, ENC_ASCII|ENC_NA, pinfo->pool, &password);
+ proto_item_append_text(auth_item, ": %s", password);
+ break;
+ case BFD_AUTH_MD5:
+ case BFD_AUTH_MET_MD5:
+ case BFD_AUTH_SHA1:
+ case BFD_AUTH_MET_SHA1:
+ if (auth_len != get_bfd_required_auth_len(auth_type)) {
+ proto_tree_add_expert_format(auth_tree, pinfo, &ei_bfd_auth_len_invalid, tvb, offset, auth_len,
+ "Length of authentication section (%d) is invalid for Authentication Type: %s",
+ auth_len, val_to_str(auth_type, bfd_control_auth_type_values, "Unknown Authentication Type (%d)") );
+
+ proto_item_append_text(auth_item, ": Invalid Authentication Section");
+ }
+
+ if (tree) {
+ proto_tree_add_item(auth_tree, hf_bfd_auth_seq_num, tvb, offset+4, 4, ENC_BIG_ENDIAN);
+
+ proto_tree_add_item(auth_tree, hf_bfd_checksum, tvb, offset+8, get_bfd_checksum_len(auth_type), ENC_NA);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static int
+dissect_bfd_echo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ proto_tree *bfd_tree = NULL;
+ guint bfd_length = tvb_reported_length_remaining(tvb, 0);
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Echo");
+ /* XXX Add direction */
+ col_set_str(pinfo->cinfo, COL_INFO, "Originator specific content");
+
+ if (tree) {
+ proto_item *ti;
+
+ ti = proto_tree_add_protocol_format(tree, proto_bfd_echo, tvb, 0, bfd_length,
+ "BFD Echo message");
+
+ bfd_tree = proto_item_add_subtree(ti, ett_bfd_echo);
+
+ proto_tree_add_item(bfd_tree, hf_bfd_echo, tvb, 0, bfd_length, ENC_NA);
+ }
+
+ return bfd_length;
+}
+
+static int
+dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ guint flags;
+ guint bfd_version;
+ guint bfd_diag;
+ guint bfd_sta = 0;
+ guint bfd_flags;
+ guint bfd_flags_a = 0;
+ guint bfd_detect_time_multiplier;
+ guint bfd_length;
+ guint bfd_my_discriminator;
+ guint bfd_your_discriminator;
+ guint bfd_desired_min_tx_interval;
+ guint bfd_required_min_rx_interval;
+ guint bfd_required_min_echo_interval;
+ proto_tree *bfd_tree = NULL;
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ bfd_version = (tvb_get_guint8(tvb, 0) & 0xe0) >> 5;
+ bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
+ flags = tvb_get_guint8(tvb, 1);
+ switch (bfd_version) {
+ case 0:
+ bfd_flags = flags;
+ break;
+ case 1:
+ default:
+ bfd_sta = flags & 0xc0;
+ bfd_flags = flags & 0x3e;
+ bfd_flags_a = flags & 0x04;
+ break;
+ }
+
+ bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
+ bfd_length = tvb_get_guint8(tvb, 3);
+ bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
+ bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
+ bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
+ bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
+ bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
+
+ switch (bfd_version) {
+ case 0:
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: 0x%02x",
+ val_to_str_const(bfd_diag, bfd_control_v0_diag_values, "Unknown"),
+ bfd_flags);
+ break;
+ case 1:
+ default:
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, State: %s, Flags: 0x%02x",
+ val_to_str_const(bfd_diag, bfd_control_v1_diag_values, "Unknown"),
+ val_to_str_const(bfd_sta >> 6 , bfd_control_sta_values, "Unknown"),
+ bfd_flags);
+ break;
+ }
+
+ if (tree) {
+ proto_item *ti;
+
+ ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, bfd_length,
+ "BFD Control message");
+
+ bfd_tree = proto_item_add_subtree(ti, ett_bfd);
+
+ proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
+ 1, bfd_version << 5);
+
+ proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
+ 1, bfd_diag);
+
+ switch (bfd_version) {
+ case 0:
+ break;
+ case 1:
+ default:
+ proto_tree_add_uint(bfd_tree, hf_bfd_sta, tvb, 1,
+ 1, bfd_sta);
+
+ break;
+ }
+ switch (bfd_version) {
+ case 0:
+ {
+ static int * const bfd_message_flags[] = {
+ &hf_bfd_flags_h,
+ &hf_bfd_flags_d_v0,
+ &hf_bfd_flags_p_v0,
+ &hf_bfd_flags_f_v0,
+ NULL
+ };
+ proto_tree_add_bitmask_with_flags(bfd_tree, tvb, 1, hf_bfd_flags, ett_bfd_flags, bfd_message_flags, ENC_NA, BMT_NO_FALSE);
+ }
+ break;
+ case 1:
+ default:
+ {
+ static int * const bfd_message_flags[] = {
+ &hf_bfd_flags_p,
+ &hf_bfd_flags_f,
+ &hf_bfd_flags_c,
+ &hf_bfd_flags_a,
+ &hf_bfd_flags_d,
+ &hf_bfd_flags_m,
+ NULL
+ };
+ proto_tree_add_bitmask_with_flags(bfd_tree, tvb, 1, hf_bfd_flags, ett_bfd_flags, bfd_message_flags, ENC_NA, BMT_NO_FALSE);
+ }
+ break;
+ }
+
+ proto_tree_add_uint_format_value(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
+ 1, bfd_detect_time_multiplier,
+ "%u (= %u ms Detection time)",
+ bfd_detect_time_multiplier,
+ bfd_detect_time_multiplier * (bfd_desired_min_tx_interval/1000));
+
+ proto_tree_add_uint(bfd_tree, hf_bfd_message_length, tvb, 3, 1, bfd_length);
+
+ proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
+ 4, bfd_my_discriminator);
+
+ proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
+ 4, bfd_your_discriminator);
+
+ proto_tree_add_uint_format_value(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
+ 4, bfd_desired_min_tx_interval,
+ "%4u ms (%u us)",
+ bfd_desired_min_tx_interval/1000,
+ bfd_desired_min_tx_interval);
+
+ proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
+ 4, bfd_required_min_rx_interval,
+ "%4u ms (%u us)",
+ bfd_required_min_rx_interval/1000,
+ bfd_required_min_rx_interval);
+
+ proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
+ 4, bfd_required_min_echo_interval,
+ "%4u ms (%u us)",
+ bfd_required_min_echo_interval/1000,
+ bfd_required_min_echo_interval);
+ } /* if (tree) */
+
+ /* Dissect the authentication fields if the Authentication flag has
+ * been set
+ */
+ if (bfd_version && bfd_flags_a) {
+ if (bfd_length >= 28) {
+ dissect_bfd_authentication(tvb, pinfo, bfd_tree);
+ } else {
+ proto_tree_add_expert_format(bfd_tree, pinfo, &ei_bfd_auth_no_data, tvb, 24, bfd_length-24,
+ "Authentication: Length of the BFD frame is invalid (%d)", bfd_length);
+ }
+ }
+
+ return tvb_captured_length(tvb);
+}
+
+/* BFD CV Source MEP-ID TLV Decoder,
+ As per RFC 6428 : https://tools.ietf.org/html/rfc6428
+ sections - 3.5.1, 3.5.2, 3.5.3 */
+void
+dissect_bfd_mep (tvbuff_t *tvb, proto_tree *tree, const int hfindex)
+{
+ proto_item *ti;
+ proto_tree *bfd_tree;
+ gint offset = 0;
+ gint mep_type;
+ gint mep_len;
+ gint mep_agi_len;
+
+ if (!tree)
+ return;
+
+ /* Fetch the BFD control message length and move the offset
+ to point to the data portion after the control message */
+
+ /* The parameter hfindex is used for determining the tree under which MEP-ID TLV
+ has to be determined. Since according to RFC 6428, MEP-ID TLV can be used by any
+ OAM function, if hfindex is 0, as per this function the MEP-TLV is a part of
+ BFD-CV payload. If a non-zero hfindex comes, then tht TLV info will be displayed
+ under a particular protocol-tree. */
+ if (!hfindex)
+ {
+ offset = tvb_get_guint8(tvb, 3);
+ mep_type = tvb_get_ntohs (tvb, offset);
+ mep_len = tvb_get_ntohs (tvb, (offset + 2));
+ ti = proto_tree_add_protocol_format (tree, proto_bfd, tvb, offset, (mep_len + 4),
+ "MPLS-TP SOURCE MEP-ID TLV");
+ }
+ else
+ {
+ mep_type = tvb_get_ntohs (tvb, offset);
+ mep_len = tvb_get_ntohs (tvb, (offset + 2));
+ ti = proto_tree_add_protocol_format (tree, hfindex, tvb, offset, (mep_len + 4),
+ "MPLS-TP SOURCE MEP-ID TLV");
+ }
+
+ switch (mep_type) {
+ case TLV_TYPE_MPLSTP_SECTION_MEP:
+
+ bfd_tree = proto_item_add_subtree (ti, ett_bfd);
+ proto_tree_add_uint (bfd_tree, hf_mep_type , tvb, offset,
+ 2, mep_type);
+ proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
+ 2, mep_len);
+ proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_section_interface_no, tvb, (offset + 12),
+ 4, ENC_BIG_ENDIAN);
+
+ break;
+
+ case TLV_TYPE_MPLSTP_LSP_MEP:
+
+ bfd_tree = proto_item_add_subtree (ti, ett_bfd);
+ proto_tree_add_uint (bfd_tree, hf_mep_type , tvb, offset,
+ 2, mep_type);
+ proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
+ 2, mep_len);
+ proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_tunnel_no, tvb, (offset + 12),
+ 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_lsp_no, tvb, (offset + 14),
+ 2, ENC_BIG_ENDIAN);
+
+ break;
+
+ case TLV_TYPE_MPLSTP_PW_MEP:
+
+ mep_agi_len = tvb_get_guint8 (tvb, (offset + 17));
+ bfd_tree = proto_item_add_subtree (ti, ett_bfd);
+ proto_tree_add_uint (bfd_tree, hf_mep_type, tvb, offset,
+ 2, (mep_type));
+ proto_tree_add_uint (bfd_tree, hf_mep_len, tvb, (offset + 2),
+ 2, mep_len);
+ proto_tree_add_item (bfd_tree, hf_mep_global_id, tvb, (offset + 4),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_node_id, tvb, (offset + 8),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_ac_id, tvb, (offset + 12),
+ 4, ENC_BIG_ENDIAN);
+ proto_tree_add_item (bfd_tree, hf_mep_agi_type, tvb, (offset + 16),
+ 1, ENC_BIG_ENDIAN);
+ proto_tree_add_uint (bfd_tree, hf_mep_agi_len, tvb, (offset + 17),
+ 1, mep_agi_len);
+ proto_tree_add_item (bfd_tree, hf_mep_agi_val, tvb, (offset + 18),
+ mep_agi_len, ENC_ASCII);
+
+ break;
+
+ default:
+ break;
+ }
+ return;
+}
+
+/* Register the protocol with Wireshark */
+void
+proto_register_bfd(void)
+{
+
+ /* Setup list of header fields */
+ static hf_register_info hf[] = {
+ { &hf_bfd_version,
+ { "Protocol Version", "bfd.version",
+ FT_UINT8, BASE_DEC, NULL , 0xe0,
+ "The version number of the BFD protocol", HFILL }
+ },
+ { &hf_bfd_diag,
+ { "Diagnostic Code", "bfd.diag",
+ FT_UINT8, BASE_HEX, VALS(bfd_control_v1_diag_values), 0x1f,
+ "This field give the reason for a BFD session failure", HFILL }
+ },
+ { &hf_bfd_sta,
+ { "Session State", "bfd.sta",
+ FT_UINT8, BASE_HEX, VALS(bfd_control_sta_values), 0xc0,
+ "The BFD state as seen by the transmitting system", HFILL }
+ },
+ { &hf_bfd_flags,
+ { "Message Flags", "bfd.flags",
+ FT_UINT8, BASE_HEX, NULL, 0x00,
+ NULL, HFILL }
+ },
+ { &hf_bfd_flags_h,
+ { "I hear you", "bfd.flags.h",
+ FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x80,
+ NULL, HFILL }
+ },
+ { &hf_bfd_flags_d_v0,
+ { "Demand", "bfd.flags.d",
+ FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x40,
+ NULL, HFILL }
+ },
+ { &hf_bfd_flags_p_v0,
+ { "Poll", "bfd.flags.p",
+ FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x20,
+ NULL, HFILL }
+ },
+ { &hf_bfd_flags_f_v0,
+ { "Final", "bfd.flags.f",
+ FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x10,
+ NULL, HFILL }
+ },
+ { &hf_bfd_flags_p,
+ { "Poll", "bfd.flags.p",
+ FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x20, /* 6 flag bits; Sta is shown separately */
+ "If set, the transmitting system is expecting a packet with the Final (F) bit in reply",
+ HFILL }
+ },
+ { &hf_bfd_flags_f,
+ { "Final", "bfd.flags.f",
+ FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x10, /* 6 flag bits; Sta is shown separately */
+ "If set, the transmitting system is replying to a packet with the Poll (P) bit set",
+ HFILL }
+ },
+ { &hf_bfd_flags_c,
+ { "Control Plane Independent", "bfd.flags.c",
+ FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x08, /* 6 flag bits; Sta is shown separately */
+ "If set, the BFD implementation is implemented in the forwarding plane", HFILL }
+ },
+ { &hf_bfd_flags_a,
+ { "Authentication Present", "bfd.flags.a",
+ FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x04, /* 6 flag bits; Sta is shown separately */
+ "The Authentication Section is present", HFILL }
+ },
+ { &hf_bfd_flags_d,
+ { "Demand", "bfd.flags.d",
+ FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x02, /* 6 flag bits; Sta is shown separately */
+ "If set, Demand mode is active in the transmitting system", HFILL }
+ },
+ { &hf_bfd_flags_m,
+ { "Multipoint", "bfd.flags.m",
+ FT_BOOLEAN, 6, TFS(&tfs_set_notset), 0x01, /* 6 flag bits; Sta is shown separately */
+ "Reserved for future point-to-multipoint extensions", HFILL }
+ },
+ { &hf_bfd_detect_time_multiplier,
+ { "Detect Time Multiplier", "bfd.detect_time_multiplier",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "The transmit interval multiplied by this value is the failure detection time", HFILL }
+ },
+ { &hf_bfd_message_length,
+ { "Message Length", "bfd.message_length",
+ FT_UINT8, BASE_DEC|BASE_UNIT_STRING, &units_byte_bytes, 0x0,
+ "Length of the BFD Control packet, in bytes", HFILL }
+ },
+ { &hf_bfd_my_discriminator,
+ { "My Discriminator", "bfd.my_discriminator",
+ FT_UINT32, BASE_HEX, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_bfd_your_discriminator,
+ { "Your Discriminator", "bfd.your_discriminator",
+ FT_UINT32, BASE_HEX, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_bfd_desired_min_tx_interval,
+ { "Desired Min TX Interval", "bfd.desired_min_tx_interval",
+ FT_UINT32, BASE_DEC, NULL, 0x0,
+ "The minimum interval to use when transmitting BFD Control packets", HFILL }
+ },
+ { &hf_bfd_required_min_rx_interval,
+ { "Required Min RX Interval", "bfd.required_min_rx_interval",
+ FT_UINT32, BASE_DEC, NULL, 0x0,
+ "The minimum interval between received BFD Control packets that this system can support", HFILL }
+ },
+ { &hf_bfd_required_min_echo_interval,
+ { "Required Min Echo Interval", "bfd.required_min_echo_interval",
+ FT_UINT32, BASE_DEC, NULL, 0x0,
+ "The minimum interval between received BFD Echo packets that this system can support", HFILL }
+ },
+ { &hf_bfd_checksum,
+ { "Checksum", "bfd.checksum",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_bfd_auth_type,
+ { "Authentication Type", "bfd.auth.type",
+ FT_UINT8, BASE_DEC, VALS(bfd_control_auth_type_values), 0x0,
+ "The type of authentication in use on this session", HFILL }
+ },
+ { &hf_bfd_auth_len,
+ { "Authentication Length", "bfd.auth.len",
+ FT_UINT8, BASE_DEC|BASE_UNIT_STRING, &units_byte_bytes, 0x0,
+ "The length, in bytes, of the authentication section", HFILL }
+ },
+ { &hf_bfd_auth_key,
+ { "Authentication Key ID", "bfd.auth.key",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "The Authentication Key ID, identifies which password is in use for this packet", HFILL }
+ },
+ { &hf_bfd_auth_password,
+ { "Password", "bfd.auth.password",
+ FT_STRING, BASE_NONE, NULL, 0x0,
+ "The simple password in use on this session", HFILL }
+ },
+ { &hf_bfd_auth_seq_num,
+ { "Sequence Number", "bfd.auth.seq_num",
+ FT_UINT32, BASE_HEX, NULL, 0x0,
+ "The Sequence Number is periodically incremented to prevent replay attacks", HFILL }
+ },
+ { &hf_mep_type,
+ { "Type", "bfd.mep.type",
+ FT_UINT16, BASE_DEC, VALS(mplstp_mep_tlv_type_values), 0x0,
+ "The type of the MEP Id", HFILL }
+ },
+ { &hf_mep_len,
+ { "Length", "bfd.mep.len",
+ FT_UINT16, BASE_DEC, NULL , 0x0,
+ "The length of the MEP Id", HFILL }
+ },
+ { &hf_mep_global_id,
+ { "Global Id", "bfd.mep.global.id",
+ FT_UINT32, BASE_DEC, NULL , 0x0,
+ "MPLS-TP Global MEP Id", HFILL }
+ },
+ { &hf_mep_node_id,
+ { "Node Id", "bfd.mep.node.id",
+ FT_IPv4, BASE_NONE, NULL , 0x0,
+ "MPLS-TP Node Identifier", HFILL }
+ },
+#if 0
+ { &hf_mep_interface_no,
+ { "Interface Number", "bfd.mep.interface.no",
+ FT_UINT32, BASE_DEC, NULL , 0x0,
+ "MPLS-TP Interface Number", HFILL }
+ },
+#endif
+ { &hf_mep_tunnel_no,
+ { "Tunnel Number", "bfd.mep.tunnel.no",
+ FT_UINT16, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mep_lsp_no,
+ { "LSP Number", "bfd.mep.lsp.no",
+ FT_UINT16, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mep_ac_id,
+ { "AC Id", "bfd.mep.ac.id",
+ FT_UINT32, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mep_agi_type,
+ { "AGI TYPE", "bfd.mep.agi.type",
+ FT_UINT8, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mep_agi_len,
+ { "AGI Length", "bfd.mep.agi.len",
+ FT_UINT8, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mep_agi_val,
+ { "AGI value", "bfd.mep.agi.val",
+ FT_STRING, BASE_NONE, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_section_interface_no,
+ { "Interface Number", "bfd.mep.interface.no",
+ FT_UINT32, BASE_DEC, NULL , 0x0,
+ "MPLS-TP Interface Number", HFILL }
+ }
+ };
+ /* BFD Echo */
+ static hf_register_info hf_echo[] = {
+ { &hf_bfd_echo,
+ { "Echo", "bfd_echo.packet",
+ FT_BYTES, BASE_NONE, NULL, 0x0,
+ "Originator specific echo packet", HFILL }
+ }
+ };
+
+ /* Setup protocol subtree array */
+ static gint *ett[] = {
+ &ett_bfd,
+ &ett_bfd_flags,
+ &ett_bfd_auth,
+ &ett_bfd_echo
+ };
+
+ static ei_register_info ei[] = {
+ { &ei_bfd_auth_len_invalid, { "bfd.auth.len.invalid", PI_MALFORMED, PI_WARN, "Length of authentication section is invalid", EXPFILL }},
+ { &ei_bfd_auth_no_data, { "bfd.auth.no_data", PI_MALFORMED, PI_WARN, "Authentication flag is set in a BFD packet, but no authentication data is present", EXPFILL }},
+ };
+
+ expert_module_t* expert_bfd;
+
+ /* Register the protocol name and description */
+ proto_bfd = proto_register_protocol("Bidirectional Forwarding Detection Control Message",
+ "BFD Control",
+ "bfd");
+ proto_bfd_echo = proto_register_protocol("Bidirectional Forwarding Detection Echo Packet",
+ "BFD Echo",
+ "bfd_echo");
+
+ /* Required function calls to register the header fields and subtrees used */
+ proto_register_field_array(proto_bfd, hf, array_length(hf));
+ proto_register_field_array(proto_bfd_echo, hf_echo, array_length(hf_echo));
+ proto_register_subtree_array(ett, array_length(ett));
+ expert_bfd = expert_register_protocol(proto_bfd);
+ expert_register_field_array(expert_bfd, ei, array_length(ei));
+
+ /* Register dissectors */
+ bfd_control_handle = register_dissector("bfd", dissect_bfd_control, proto_bfd);
+ bfd_echo_handle = register_dissector("bfd_echo", dissect_bfd_echo, proto_bfd_echo);
+}
+
+void
+proto_reg_handoff_bfd(void)
+{
+ dissector_add_uint_range_with_preference("udp.port", UDP_PORT_RANGE_BFD_CTRL, bfd_control_handle);
+ dissector_add_uint("udp.port", UDP_PORT_BFD_ECHO, bfd_echo_handle);
+
+ dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_BFD_CC, bfd_control_handle);
+ dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_BFD_CV, bfd_control_handle);
+ dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_BFD, bfd_control_handle);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-18 10:23:35 +0000